High [CVE-2026-111880] Denial of Service via heap out-of-bounds write in NTLM authentication
This high-severity Red Hat Linux advisory covers CVE-2026-111880; related products: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8.
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Summary
Denial of Service via heap out-of-bounds write in NTLM authentication. Red Hat rates this important (CVSS 7.4).
Weakness: CWE-787.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; and 1 more.
Affected products named by the advisory: Red Hat package: freerdp.
- < 2.0.0
- < 3.32.0
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- Do not expose FreeRDP server or proxy endpoints that use SspiNtlmHashCallback to untrusted networks; restrict access with a host firewall and network segmentation. If the NTLM hash callback is not required, leave it unset so the vulnerable MIC path is not entered. --- CME Mitigation Guidance (2026-10-20) --- Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure. The highest-value action is to enforce bounds validation on Message Integrity Check (MIC) offsets within the authenticate message buffer before writing in ntlm_computeMicValue: upgrade to FreeRDP 3.32.0 (or the fixed Freerdp builds), which validate that the MIC offset is within the authenticate message buffer bounds before writing bytes, closing crafted NTLM AUTHENTICATE_MESSAGE with backward session-key offset and out-of-bounds MIC offset. Until patched, this is a concern on FreeRDP server and proxy instances configured with the non-default SspiNtlmHashCallback setting, so leave SspiNtlmHashCallback unset if NTLM hash callbacks are not required, and restrict network access to FreeRDP endpoints from untrusted networks using firewalls and network segmentation. As a compensating measure, configure systemd service restart and watchdog settings to automatically restart FreeRDP upon process crashes and mitigate prolonged denial of service, require pre-authentication through a zero-trust gateway or identity-aware proxy before clients can reach the FreeRDP NTLM authentication handler, and restrict FreeRDP port access with host firewalls using firewalld or nftables to isolate the service from untrusted networks. These controls limit blast radius and contain exploitation, but they do not fix the underlying heap out-of-bounds write defect — apply the upstream patch to fully remediate. Highest-impact CME: CME-1311 Input Size and Quantity Bounds Enforcement (high)
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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